Transcript for Audra McDonald's Unforgettable Voice on the Number One Album in America

Finally tonight, a Broadway sensation has become a number one album in America. Audra M cdonald becomes Billie holiday every night. Reporter: It's not a stretch of the imagination to think you're thinking to Billie ha hallid hallidha hallid Halliday. But this is holiday. This is McDonald. How do you do that? It was a long, long journey to find her voice. I'm still searching for it every night. ? Reporter: McDonald's uncanny ability to capture Holliday may by why she has done what no one else has. Earning her sixth Tony award. More than any other performer. I want to thank my mother and father for not medicating their daughter. I can't imagine my life getting any better than this moment. ? Reporter: Despite her down to Earth personality, McDonald is Broadway royalty. She becomes her well before she gets to the stage. I take gin. I put it here, and here. Reporter: She even wears Holliday's perfume. Do you get nervous? Yes, every tight. Reporter: The audience is style applauding. I'm standing on Lena Horne's shoulders. I just want to say thank you. Hopefully there's a little girl that will say, I will stand on your shoulders.

This transcript has been automatically generated and may not be 100% accurate.

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